This is true 5.56x45mm mil-spec, new, unfired, heavy duty brass with that is recent production with a Lake City headstamp. It is the same brass
Gun Collectors Dream Auction #37 Sept 19th & 20th
Who makes the best bullets for reloading? - Quora
Who makes the best bullets for reloading? - Quora
Lake City Brass « Daily Bulletin
When comparing ammo cost in the long run, is it cheaper to reload your own 556/223 rather than use 22lr? - Quora
Poulin Antiques & Auctions, Inc Auction Catalog - SESSION 5 - FABULOUS FIREARMS & MILITARIA AUCTION! Online Auctions
May 2022 Premier Firearms & Militaria Auction - Day 1 by PoulinAuctions - Issuu
Is it inadvisable to use two different ammos in a single magazine? - Quora
Lake City « Daily Bulletin